General Discharge Permit

General Permit For Discharges of Stormwater Associated With Industrial Activity
Maryland General Permit No. 12-SW-A 

 ​Important Announcement (updated December 6, 2018) 

The Department has issued a final determination for a modification to the General Permit for Discharges of Stormwater Associated With Industrial Activity, identified as General Permit 12-SW-A.  The effective date of Modification A is December 7, 2018.  Please see the documents posted below for complete details regarding the changes made for this modification.
Note that the General Permit 12-SW-A has an expiration date of December 31, 2018.  The Department is developing a renewal permit, and until such time that the permit is reissued, the existing permit will be administratively extended (per the terms of the permit).  Please check back here for updates as progress is made towards that end.  Once a draft of the new permit has been proposed to open the public participation process, the Department will take comments prior to arriving at a final permit. ​



Guidance Documents

Supplemental Information

Contact Info

For more information on this permit, contact the Industrial and General Permits Division at (410) 537-3323.

Additional Information and Related Links